16661616172 has 6 divisors (see below), whose sum is σ = 29157828308. Its totient is φ = 8330808084.

The previous prime is 16661616163. The next prime is 16661616199. The reversal of 16661616172 is 27161616661.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2082702018 + ... + 2082702025.

Almost surely, 2^16661616172 is an apocalyptic number.

It is an amenable number.

16661616172 is a deficient number, since it is larger than the sum of its proper divisors (12496212136).

16661616172 is a wasteful number, since it uses less digits than its factorization.

16661616172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4165404047 (or 4165404045 counting only the distinct ones).

The product of its digits is 108864, while the sum is 43.

The spelling of 16661616172 in words is "sixteen billion, six hundred sixty-one million, six hundred sixteen thousand, one hundred seventy-two".